>>> double trouble for san francisco's muni tonight. problems below ground, and above delay tens of thousands of passengers during the evening commute. good evening, i'm gasia mikaelian in for julie haener. >> i'm frank somerville. and electrical problem has stopped all muni service in san francisco. the problem started right at the height of the evening commute. so far, it's unknown if the problem can be repaired in time for tomorrow. more now from amber lee, live in the city, where she just got an upclose look at the blown transformer causing the outage. >> reporter: right now, you can see the caution tape is up, keeping passengers from trying to get inside the train station. >> it's a blown fuse. >> reporter: john haley, muni director of transit showed the blown transformer. he says crews will be working through the night to try to fix the problem before tomorrow morning's commute. >> we know it's not the outside feed from pg and e, and we know the problem is within our hardware. >> reporter: as for commuters tonight, it was a headache getting to their destination. as late as 8:0